Constantin C. Nikiforoff, 92, a soil scientist here and in his native Russia, died Tuesday at his Hyattsville home after a heart attack.

Dr. Nikiforoff was born in Pskov, Russia. He was educated in Russia and Switzerland and earned a doctorate in soil science from the University of St. Petersburg in 1912.

He conducted soil research expeditions in Siberia and was a soil expert for the Department of Agriculture and Land Improvement in Russia. He served as an officer in the Imperial Russian Army during World War I.

After the Russian Revolution, Dr. Nikiforoff left Russia through Turkey, and in 1921, came to the United States on a League of Nations pass.

His early years in this country were spent as a farm laborer in New York and Minnesota because he was a refugee with no academic or professional documentation. In 1927, he met by chance another soil scientist from Russia who was visiting here. This meeting led to Dr. Nikiforoff's acceptance at the Unversity of Minnesota, where he became an instructor and assistant professor of soil science.

He came to Washington in 1931, and was employed as a soil scientist for the Department of Agriculture until his retirement in 1957. He also was a consultant for a number of research agencies and worked as a free-lance translator for the Department of State.

Dr. Nikiforoff was a member of the Soil Science Society, the New York and National academics of sciences, the International Society of Soil Science and the Cosmos Club of Washington.

There are no immediate survivors.